<!doctype html>
<html>
<head>
  <title>CodeMirror 2: Mode-Changing Demo</title>
  <link rel="stylesheet" href="../lib/codemirror.css">
  <script src="../lib/codemirror.js"></script>
  <link rel="stylesheet" href="../theme/default.css">
  <script src="../mode/javascript/javascript.js"></script>
  <script src="../mode/scheme/scheme.js"></script>
  <link rel="stylesheet" href="../css/docs.css">

  <style type="text/css">
    .CodeMirror {
      border: 1px solid black;
    }
  </style>
</head>
<body>
<h1>CodeMirror 2: Mode-Changing demo</h1>

<form><textarea id="code" name="code">
  ;; If there is Scheme code in here, the editor will be in Scheme mode.
  ;; If you put in JS instead, it'll switch to JS mode.

  (define (double x)
  (* x x))
</textarea></form>

<p>On changes to the content of the above editor, a (crude) script
  tries to auto-detect the language used, and switches the editor to
  either JavaScript or Scheme mode based on that.</p>

<script>
  var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
    mode:"scheme",
    lineNumbers:true,
    matchBrackets:true,
    tabMode:"indent",
    onChange:function () {
      clearTimeout(pending);
      setTimeout(update, 400);
    }
  });
  var pending;
  function looksLikeScheme(code) {
    return !/^\s*\(\s*function\b/.test(code) && /^\s*[;\(]/.test(code);
  }
  function update() {
    editor.setOption("mode", looksLikeScheme(editor.getValue()) ? "scheme" : "javascript");
  }
</script>
</body>
</html>
